The image of a function passes through point a (- 1,3) and point (2,3), the analytic expression of the function is obtained, and whether point C (- 2,5) is on the image of the function is judged

The image of a function passes through point a (- 1,3) and point (2,3), the analytic expression of the function is obtained, and whether point C (- 2,5) is on the image of the function is judged

Let the analytic expression of the function be y = KX + b k ≠ 0
3=b-k
-3=2k+b
6=-3k
k=-2
b=1
Analytical formula: y = - 2x + 1
When x = - 2, y = 4 + 1 = 5
The point C (- 2,5) is on the function image